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-19.5x+21=108.75
We move all terms to the left:
-19.5x+21-(108.75)=0
We add all the numbers together, and all the variables
-19.5x-87.75=0
We move all terms containing x to the left, all other terms to the right
-19.5x=87.75
x=87.75/-19.5
x=-4+5.5714285714286/11.142857142857
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